Robust near-infrared light bullet in 800-nm femtosecond light filaments in air

Panov, N. A.; Andreeva, Vera; Uryupina, D. S.; Savel’ev, A. B.; Kosareva, O.G.; Chin, See Leang

doi:10.1007/s00340-015-6180-3

Cited by 11 publications

(11 citation statements)

References 21 publications

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“…Previous phenomenological treatments of the problem of radiation from the plasma filament induced by a powerful laser pulse, such as [14,[24][25][26][27], did not take into consideration quantitative selection between the dipole and quadrupole mechanisms of generation of the THz radiation. Here we consider contributions of both dipole and quadrupole currents inside the filament.…”

Section: A Model Of Thz Radiationmentioning

confidence: 99%

Impact of the dipole contribution on the terahertz emission of air-based plasma induced by tightly focused femtosecond laser pulses

et al. 2017

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The present paper studies the generation mechanism of terahertz (THz) radiation from tightly focused femtosecond laser pulses in a gas medium. We measured the angular radiation pattern under different focusing conditions and observed that, with the deepening of focus, the angular radiation pattern changes and optical-to-THz conversion efficiency increases. The analysis of the observed phenomena led to the assumption that the dipole radiation prevails in most cases despite the existing conception regarding the dominating role of the quadrupole mechanism of radiation. Based on these assumptions, the transient photocurrent theory of the phenomenon presented in this paper was developed by us and used for the numerical fit of the experimental data.

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Section: A Model Of Thz Radiationmentioning

confidence: 99%

Impact of the dipole contribution on the terahertz emission of air-based plasma induced by tightly focused femtosecond laser pulses

et al. 2017

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“…In a bulk medium with weak dispersion, where spatial effects come into play, the high-intensity part of the pulse undergoes redshift and self-focusing simultaneously. Therefore, the redshifted local maximum remains on the beam axis [31].…”

Section: Role Of Delayed Nonlinearitymentioning

confidence: 97%

“…Near-to mid-infrared femtosecond pulse nonlinear transformation along the extended path in air has a distinct feature of self-shifted robust light bullet formation in the Stokes wing of the supercontinuum [16,27,30,31]. Since the essential amount of the initial pulse energy is transferred to the Stokes side of the spectrum, the location of the Stokes hump relatively to the absorption band will affect the pulse energy losses, i.e., the actual nonlinear transparency of air.…”

Section: Nonlinear Transparency Window In Mid-infraredmentioning

confidence: 99%

“…With propagation the distinctly pronounced harmonics up to the 15th [19,22,23] introduce strong spectral intensity modulation smoothed over by the supercontinuum [24,25]. The Stokes side of the continuum reveals a robust well-separated hump [26][27][28][29], which continuously downshifts its central frequency and consumes up to ten percent of the pulse energy [27,30,31] with propagation.…”

Section: Introductionmentioning

confidence: 99%

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Nonlinear transparency window for ultraintense femtosecond laser pulses in the atmosphere

et al. 2019

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We have found the optimum range of driver wavelengths for mid-infrared ultraintense femtosecond pulses undergoing filamentation in atmospheric air. This wavelength range between 3.1 and 3.5 μm forms a nonlinear transparency window identified through a diligent scan of pulse central wavelengths in the range 2.2-4.7 μm with a best resolution of 5 nm. Each of 123 wavelengths scanned corresponds to the solution of the full threedimensional + time pulse propagation and filamentation problem on a 7-19 m path in air. Due to the discovered universal asymmetric character of the nonlinearly enhanced linear absorption in the vicinity of atmospheric molecular band, the optimum driver wavelength belongs to the long-wavelength side of the band.

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“…The terms of FME and Eq. (3) are the same, so such representation allows us to easily adapt our FME solver [25] for the case of arbitrary polarization. Denominations in Eq.…”

Section: Modelmentioning

confidence: 99%

Supercontinuum of a3.9−μmfilament in air: Formation of a two-octave plateau and nonlinearly enhanced linear absorption

et al. 2016

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Through numerical simulations we reveal the scenario of 3.9-μm filament spectrum enrichment in the atmosphere in the cases of linear and circular polarization of the incident pulse. The discrete spectrum of odd harmonics transforms into the two-octave plateau in the case of linear polarization. In contrast, in the case of circular polarization of the incident pulse, the harmonic-free flat supercontinuum appears with the plasma onset, reaching the tenth harmonic of the input radiation. We identify the energy balance specific to the filamentation near 4 μm: the absorption on CO 2 lines in the atmosphere is accelerated by the self-phase modulation in the Kerr nonlinearity early before the plasma channel is formed. This nonlinearly enhanced linear absorption overwhelms the plasma losses and conversion of the input pulse energy to the higher harmonics as well as the plateau.

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Robust near-infrared light bullet in 800-nm femtosecond light filaments in air

Cited by 11 publications

References 21 publications

Impact of the dipole contribution on the terahertz emission of air-based plasma induced by tightly focused femtosecond laser pulses

Impact of the dipole contribution on the terahertz emission of air-based plasma induced by tightly focused femtosecond laser pulses

Nonlinear transparency window for ultraintense femtosecond laser pulses in the atmosphere

Supercontinuum of a3.9−μmfilament in air: Formation of a two-octave plateau and nonlinearly enhanced linear absorption

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